package com.leyou.item.service.impl;

import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.leyou.common.exception.LyException;
import com.leyou.item.dto.SpecGroupDTO;
import com.leyou.item.dto.SpecParamDTO;
import com.leyou.item.entity.SpecGroup;
import com.leyou.item.mapper.SpecGroupMapper;
import com.leyou.item.service.SpecGroupService;
import com.leyou.item.service.SpecParamService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service
public class SpecGroupServiceImpl extends ServiceImpl<SpecGroupMapper, SpecGroup> implements SpecGroupService {
    @Autowired
    private SpecParamService paramService;
    @Override
    public List<SpecGroupDTO> querySpecList(Long categoryId) {
        // 查询规格组
        List<SpecGroupDTO> groupList = SpecGroupDTO.convertEntityList(query().eq("category_id", categoryId).list());
        if(CollectionUtils.isEmpty(groupList)){
            throw new LyException(404, "该分类下的规格组不存在！");
        }
        // 查询规格参数
        List<SpecParamDTO> paramList = paramService.queryParams(categoryId, null, null);
        // 对规格参数分组，groupId一致的在一组
        Map<Long, List<SpecParamDTO>> map = paramList.stream().collect(Collectors.groupingBy(SpecParamDTO::getGroupId));
        // 把参数放入group
        for (SpecGroupDTO groupDTO : groupList) {
            groupDTO.setParams(map.get(groupDTO.getId()));
        }
        return groupList;
    }

}